There are a great number of civil war swords in the world. Many of these have been used in military combats as well. In fact, a lot of the castoffs from military battles have found their ways into the hands of civilians; not out of desire, but mostly out of the necessity to arm themselves with any weapon whatsoever. It should be noted that there are lots of notable civil wars that have already happened in the history of the world, both in the ancient world and in modern times. And as such, these civil war swords can be distinctly classified according to the actual location and period where they were used.
For example: the rapier was one of the most popular swords in Europe during the 16th and 17th centuries. For a while, people favored this weapon because it was light and can stab quite easily. It served its purpose during singular duels. However, the rapier was soon abandoned because it became ungainly to wield in the battlefields. This was replaced by a whole range of backswords like cutlasses and sabers which was easier to brandish when confronted with a lot more adversaries.
Another example: the civil war that led to the downfall of the Eastern Han Dynasty in China. General Guan Yu had utilized the most unusual sword to defeat his adversaries. The guandao (also known as kwandao and the yan yue dao) was a large, flat and curved sword attached to the end of a pole. It was used by striking at heads and legs with a sweeping motion. Although these were useless in close quarters combat, it was utilized to create as much damage as feasible among singular enemy combatants.